这句的谓语动词是promise.
promise sb to do sth 允诺某人做某事,这里使用help取代了do
help sb to do sth 帮助某人做某事,这里用buy 取代了 do
也就是说help 和 buy都是【不定式】.不是谓语动词.
英语语法he promised to help us to buy the house 这句话中 help 和buy 不
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